Question about Cadillac Cars & Trucks
The back manifold ( closest to the fire wall) is bank l
there are not 2 x O2 sensors up stream
they are heated oxygen sensors (HO2S) and are in the manifold or exhaust pipe before the cat converter
The 2 x O2 sensors are after the cat converter in the exhaust pipe
so bank 1 sensor 1 is a HO2S sensor
there is a difference in the sensors as the HO2S report exhaust gas conditions to the ECM for fuel /air adjustments , have 4 wires and are heated to read the gas correctly
the after cat converter sensors ar O2 sensors and report on the cat converter action to further adjust the air /fuel mix in the ECM
Posted on Mar 17, 2016
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Posted on Jan 02, 2017
BANK 1 SENSOR 1 IS THE ONE IN THE EXHAUST MANIFOLD. BANK 2 SENSOR 2 IS BELOW THE CATALYTIC CONVERTER.
P0171 SHOULD GO AWAY WITH A GOOD O2 SENSOR BUT DO CHECK FOR VACUUM LEAKS TO BE SURE. 3.1/3.4L ENGINES HAVE A BAD DESIGN INTAKE MANIFOLD GASKET, THE LEAK OIL, COOLANT, AND AIR.
Posted on Jul 13, 2009
SOURCE: 2004 Cadillac Seville bank 1
Heating may help but it could be dangerous due to limited space. What you might try is start engine get mamifold hot. Shut off engine and use WD-40 and let it soak in, brake fluid also works like WD-40 but make sure the manifold is not so hot that it will burst into flame. Another way is to remove the two front bolts from the endine cradle and let the engine assembly down. this will give you more room. cut wires off get a 6 sided deep socket. If that fails use a air hammer to knock it loose. Hope this helps.
Posted on Aug 31, 2010
Testimonial: "Good balance between brute force and alternative methods, such as WD40."
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